vitamin b12 injection for athletes dosage The Benefits of B12 Shots from Arizona IV Medics in Hydroxocobalamin (B12) Injection, 2mg/mL |

[DOI] [PubMed] [Google Scholar] 35.Rushton D.H., Ramsay I.D., Norris M.J., Gilkes J.J.H

research shows no additional benefit above 1 mg daily Important: Doses above 1 mg (1,000 mcg) daily showed no additional metabolic benefits in clinical research

You mention you follow a strict vegan diet

(PubMed) Hankey GJ

In fact, its thought that as many as 90% of the people who follow these diets are deficient in vitamin B-12 because one of the only natural sources for B-12 is in animal food products

There is no risk of dangerous overdose from typical multivitamins alongside the shot, but any more than that (like multiple high-dose supplements) should be avoided